Just curious at maybe looking at some other lenses in that range before it gets here. Smaller size also helps as I will be doing a lot of backpacking with this kit.

If you aren't going to bring a tripod, this is a lens you should consider.

If you're going to take the camera backpacking (and if you're asking about a wide angle lens), it's a good bet you're going to use it for landscapes. And since you have a full frame camera, 24 mm is a magical focal length. In fact, I'm convinced that there are only two focal lengths: 24 mm, and everything else.